avsync-lib: support adjusting PCR master start threshold [1/2]

PD#TV-51849

Problem:
PCR master need to set start threshold

Solution:
Adjust msync system node

Verify:
TM2 + Llama

Change-Id: I034261bf34977f537d2066b20e5907bace9d39ce
3 files changed
tree: ac0dad9cbf607a4aa95b95d952566a360f9f4c31
  1. src/
  2. avsync-lib.mk
  3. Config.in
  4. Makefile
  5. VERSION
  6. version_config.sh